-
SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
-
QR-Code-generator
High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.
-
keepassxc
KeePassXC is a cross-platform community-driven port of the Windows application “Keepass Password Safe”.
-
InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
-
TordlWalletProtocols
This repository documents various methods for securely backing up and storing bitcoins.
Cross-platform, open-source text string encryptor. https://github.com/a3diti/aes256-offline/
KeepassXC: https://keepassxc.org/
Cross-platform, open source QR code generators: https://kazuhikoarase.github.io/qrcode-generator/js/demo/
See BIP-39
I suggest checking out The Tordl Wallet Protocols which are holistic guides for how to securely self custody your bitcoin. It includes guidance on how to store your seeds.